When's my baby due ?

My last period was 25/12/14. I have a 28 day cycle. Had sex only on the day I ovulated and two days after. One hospital says I'm due on 28th September and the other hospital says I'm due on 1st October. So who's right ?

going by ladt menstrual period, you would be due on the 1st of October. However, you should have had a scan at 12 weeks, where they would have adjusted this date based on the size of the baby, and this is the date that will be used on your MatB form, etc.